iStockphoto/Thinkstock(PRESTWICK, Scotland) -- An Egypt Air flight bound for New York City had to make an emergency landing in Scotland after a passenger found a note in the bathroom saying that a passenger planned to set fire to the plane.

BBC News reports that a BBC producer was on the plane and found a note in the plane's toilet that read "I'll set this plane on fire." The note also contained a seat number – seat 46D. The producer immediately alerted the cabin crew, and the flight was escorted by a Royal Air Force interceptor to Glasgow Prestwick Airport in Scotland.

The plane’s 326 passengers were initially kept on board while authorities worked to determine the credibility of the threat. A SWAT team surrounded the aircraft with their guns drawn while bomb experts conducted a search before removing each passenger from the plane one-by-one.

Glasgow Prestwick Airport remained open during the incident.

Police officers tell ABC News that they are continuing to investigate the circumstances of the incident which they are treating as a criminal offense rather than a terrorist related one. All of the passengers who were on the flight were interviewed but police have not been able to determine who was responsible for this note yet or if it was a hoax.

The flight landed at its final destination, New York City’s JFK Airport, on Sunday morning, a full 14 hours late.